A practical reference on Epithalamin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-12-22. Anything still debated is marked as such rather than presented as settled.
Solubility is high in water, phosphate-buffered saline and normal saline, a pattern that follows from the two acidic residues in the chain. The peptide dissolves poorly in non-polar solvents such as hexane or chloroform. Stock solutions are often prepared in water first and then diluted into the buffer of interest. Because the molecule is small and hydrophilic, filtration through a low-protein-binding membrane is usually straightforward, and visible particulates are uncommon in freshly made solutions.
Identity and purity are established with reversed-phase high-performance liquid chromatography and mass spectrometry. The chromatogram shows the main peak and any truncated or oxidised by-products, while the mass spectrum confirms the expected 390 dalton mass. Amino acid analysis can corroborate composition when a sample's origin is uncertain. Counterion content, particularly residual trifluoroacetate from purification, is frequently reported alongside purity because it shifts the net mass of the solid.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised and often hygroscopic |
| Solubility class | Freely soluble in water | Poor solubility in non-polar solvents |
| Typical storage temperature | -20 degrees Celsius or colder | Sealed, desiccated, protected from light |
| Typical analytical method | Reversed-phase HPLC with mass spectrometry | Establishes purity and confirms mass |
| Common salt form | Trifluoroacetate or acetate | Counterion reported alongside purity values |
Identity and purity are checked by reversed-phase high-performance liquid chromatography, usually with ultraviolet detection near 214 nanometres, where the peptide bond absorbs. Mass spectrometry confirms the expected mass and reveals whether truncation products or adducts are present. Acid hydrolysis followed by amino acid analysis gives the residue ratio, which should approximate one alanine, one glutamate, one aspartate and one glycine. Counter-ions such as acetate or trifluoroacetate remain in the dried product and lower net peptide content, so a stated purity figure on a label does not by itself describe how much peptide a vial holds.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
Freeze-dried epitalon is normally kept at minus twenty degrees Celsius in a sealed, desiccated container, protected from light. Short excursions at ambient temperature during shipping are generally tolerated, but repeated warming and cooling cycles encourage moisture uptake, which shortens shelf life. Once dissolved, the peptide is far less stable than the solid: aqueous solutions are subject to hydrolysis and to deamidation at the aspartate and glutamate residues. Working solutions are therefore held refrigerated and used within days, and repeated freezing and thawing of the same vial is best avoided.
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
Discussions in the literature often conflate three distinct entities: the pineal extract epithalamin, the isolated tetrapeptide AEDG, and commercial preparations sold under similar names. Reviews citing older Russian-language studies sometimes omit detail on purity, route of administration and control groups, which makes cross-study comparison difficult. Researchers working with the compound generally note the need for independent replication, standardized enzyme assays, and clearer reporting of peptide identity. These caveats are relevant when weighing claims that appear in secondary sources rather than in primary reports.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
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10 January – British Post Office scandal: Prime Minister Rishi Sunak announces that emergency legislation would be brought through Parliament to "swiftly exonerate and compensate victims" of the Post Office scandal in England and Wales. First Minister of Scotland Humza Yousaf confirms those in Scotland convicted because of the scandal would also be cleared, and that he would work with the UK government to bring this about. 11 January – The Liberal Democrats ask Ofcom to investigate GB News over alleged bias in its coverage of the Post Office scandal, including what the party's deputy leader, Daisy Cooper, describes as "a fictitious monologue" Nigel Farage delivered about Sir Ed Davey, which she says contained "a number of factual inaccuracies". First Minister of Scotland Humza Yousaf confirms that the Scottish Government would "in essence replicate" the law in England and Wales banning unlicensed ownership of American XL bully dogs. Sunak authorises joint UK–US air strikes against Houthi rebels following attacks against cargo shipping targets in the Red Sea. 12 January – The Liberal Democrats, Scottish National Party and Plaid Cymru call for a recall of parliament to enable a vote on RAF involvement in the air strikes against Houthi rebels in Yemen, since Parliament had already risen for the weekend when Sunak authorised the UK's participation. Sunak authorises talks between the Labour Party and the civil service ahead of a general election later in the year to ensure a smooth transition if Labour becomes the party of government.
=== Pharmacokinetics === Meclizine reaches peak plasma concentration in about 1.5 hours and has an elimination half-life of 5–6 hours. Despite its relatively short half-life, the drug is reported to remain effective for motion sickness for 12 – 24 hours. Meclizine has low bioavailability (22–32%) and a delayed onset to action in part due to its poor solubility in water (0.1 mg/ml) and gastrointestinal fluid. In children it has been found that taking meclizine with food increases its bioavailability slightly. It is metabolized in the liver by the CYP2D6 enzyme. Ten metabolites have been identified. In rats, the main metabolite is norchlorcyclizine, which distributes extensively through body tissue.
Sources: en.wikipedia.org
an L-amino acid + H2O + O2 ⇌ a 2-oxo acid + NH3 + H2O2 The enzyme was first described in 1944 by A. Zeller and A. Maritz. Not only are LAAOs quite variable in terms of molecular mass, they also vary widely regarding stability. In a similar vein, this enzyme performs in a myriad of biological activities including apoptosis-induction, edema-induction, hemorrhaging, and inhibition or induction of platelet aggregation. As suggested by the name of the family, LAAOs are flavoenzymes which function to catalyze the stereospecific oxidative deamination of an L-amino acid. The three substrates of the enzymatic reaction are an L-amino acid, water, and oxygen. The products are the corresponding α-keto acid (2-oxo acid), ammonia, and hydrogen peroxide. One example of the enzyme in action occurs with the conversion L-alanine into pyruvic acid (2-oxopropanoic acid):
This is an example of the Nernst equation. The potential is known as a reduction potential. Standard electrode potentials are available in a table of values. Using these values, the actual electrode potential for a redox couple can be calculated as a function of the ratio of concentrations. The equilibrium potential for a general redox half-reaction (See #Equilibrium constant above for an explanation of the symbols)
==== Diabetes ==== A meta-analysis reported that vitamin D supplementation significantly reduced the risk of type 2 diabetes for non-obese people with prediabetes. Another meta-analysis reported that vitamin D supplementation significantly improved glycemic control [homeostatic model assessment-insulin resistance (HOMA-IR)], hemoglobin A1C (HbA1C), and fasting blood glucose (FBG) in individuals with type 2 diabetes. In prospective studies, high versus low levels of vitamin D were respectively associated with a significant decrease in risk of type 2 diabetes, combined type 2 diabetes and prediabetes, and prediabetes. A systematic review included one clinical trial that showed vitamin D supplementation together with insulin maintained levels of fasting C-peptide after 12 months better than insulin alone.
Cárdenas' capture in 2003 and extradition in 2007 weakened the cartel, but the resulting fragmentation and the independence of Los Zetas intensified violence in the context of the drug war, leaving a lasting legacy of conflict in Mexico in the decades that followed. Following the capture of Osiel Cárdenas Guillén in 2003 and his extradition in 2007, leadership fell to Jorge Eduardo Costilla Sánchez, a key figure in the Gulf Cartel, who led the criminal organization until 2012. Internal dynamics and rivalries, especially with Los Zetas, defined his era. The pursuit of Joaquín "El Chapo" Guzmán from 2001 to 2014 is a pivotal case in the context of the 21st-century global war on drugs, as it exemplifies the challenges of combating sophisticated transnational criminal organizations. Guzmán, as the leader of the Sinaloa Cartel, orchestrated one of the most powerful drug trafficking networks, responsible for smuggling vast quantities of narcotics into the United States and Europe, generating billions in illicit revenue. His 2001 escape from a high-security Mexican prison and subsequent evasion until his 2014 capture highlighted the systemic corruption, institutional weaknesses, and cross-border complexities that hinder effective counter-narcotics strategies. The operation to apprehend him, involving Mexican authorities and U.S.
Sources: en.wikipedia.org
=== Discontinuation === The British National Formulary recommends a gradual withdrawal when discontinuing antipsychotics to avoid acute withdrawal syndrome or rapid relapse. Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite. Other symptoms may include restlessness, increased sweating, and trouble sleeping. Less commonly there may be a feeling of the world spinning, numbness, or muscle pains. Symptoms generally resolve after a short period of time. There is tentative evidence that discontinuation of antipsychotics can result in psychosis. It may also result in reoccurrence of the condition that is being treated. Rarely tardive dyskinesia can occur when the medication is stopped.
Enobosarm reached phase 2 clinical trials for this indication, but development was discontinued due to lack of effectiveness in a phase 2 study. Subsequently, enobosarm was repurposed again for the treatment of androgen receptor-positive (AR+) estrogen receptor-positive (ER+) breast cancer. As of November 2023, it is in phase 3 clinical trials for the treatment of this type of breast cancer. Increases in lean body mass and muscle strength as a secondary benefit with enobosarm are also being evaluated in these women. These trials are notably employing several-fold higher doses of enobosarm than were assessed in the muscle wasting phase 3 trials (9 mg/day versus 3 mg/day, respectively). In January 2024, it was announced that enobosarm was being developed for prevention of muscle wasting and augmentation of fat loss in combination with glucagon-like peptide-1 (GLP-1) receptor agonists like semaglutide for weight loss. A phase 2b clinical trial for this indication with 3 to 6 mg/day enobosarm in sarcopenic obese or overweight elderly individuals is being prepared. According to GTx, the original developer of enobosarm, a total of 25 clinical studies have been carried out on more than 1,700 people involving doses from 1 to 100 mg as of 2020. However, enobosarm has not yet completed clinical development or been approved for any use.
=== Loading === At the beginning of the run, a mixture of solutes to be separated is applied to the column, under conditions selected to promote high retention. The higher-affinity solutes are preferentially retained near the head of the column, with the lower-affinity solutes moving farther downstream. The fastest moving component begins to form a pure zone downstream. The other components also begin to form zones, but the continued supply of the mixed feed at head of the column prevents full resolution.
Sources: en.wikipedia.org
Sealed lyophilised powder is normally kept at minus twenty degrees Celsius or below, away from light and moisture. Vials are allowed to reach room temperature before opening to limit condensation. Repeated warming and cooling of the same vial is discouraged.
Reversed-phase HPLC establishes purity and separation from related peptides, and mass spectrometry confirms the molecular mass. Amino acid analysis can verify residue composition. No single method proves identity on its own, so the results are read together.
Yes. Residual trifluoroacetate or acetate from purification adds mass and can shift the value obtained by certain assays. Purity figures are therefore meaningful only when the counterion form is stated. Reporting both peptide content and salt form gives a clearer picture.
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.